Improvement in furnace-doors for boilers



"NrTED 1STATES PATENT OFFICE.

JAMES PENKETH, OF CHICAGO, ILLINOIS, .ASSIGNOR TO HIMSELF AND JOHN E.EASTMAN, OF SAME PLACE.

IMPROVEMENT IN FURNACE-DOOPLS FOR BOILEPLS.

Speeication forming part of Letters Patent No. 46,423, dated February14, 1865.

To @ZZ whom it may concern:

Be it known that I, JAMES PENKETH, of Chicago, in the county of Cook andState of Illinois, have invented a new and useful ImprovementinFurnace-Doors for Steam-Boilers; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings and letters of reference markedthereon, which form a part of this specification, and in which- Figure 1represents a front elevation of the boiler; Fig. 2, a central sectionalview of the front part of the boiler.

The nature of my invention consists in a novel method ot' joiningtogether the plate that forms the furnace and the outside plate of theboiler around the. aperture or door for admission of fuel `nto thefurnace.

To enable those skilled in the art to manufacture and use my invention,I will proceed to describe the same with particularity.

The same letters of reference refer to the corresponding parts in thedifferent figures.

A represents the outside plate of a steamboiler, showing the edge aroundthe door of the furnace turned in, as shown at J J.

E is the plate that contains the fire of the furnace, and has its edgesaround said door turned out, as shown at K K.

1I represents the space inside the furnace for the ire, and F the spacefor the water between the two plates. The door-space B, formed by thelip J ofthe boiler-plate A, and also the one formed by the lip K of thefurnace-plate E, are of such sizes comparatively that the lip on oneplate will fit tightly within the lip of the other plate, so that whenthe boiler is put together one shall lap over the other, as shown at II.

D represents the rivets by which the lips are irmly bolted together 5and C represents the edge of the lip K, which is represented in thedrawings to be inside of the lip J.

'Ihe usual method of constructing the said aperture or door of thefurnace is to have a separate metallic ring or hoop of suitable size forthe door, to which the lips of the plates A and E are riveted.

The ring, in order to be sufficiently strong to stand the pressure ofwater from within and the wear and tear of putting in fuel, Src., fromwithout, must be constructed much thicker than the plates that arefastened to it. This occasions great strain on the bolts which fastenthe plates to the ring whenever the furnace is heated, from the factthat the plates will expand from the effect of the heat much quickerthan the thick ring, and in a short time there is leakage around saidbolts, which necessitates frequent repairs.

My method does away with the metallic ring, thereby diminishing thefirst cost, and at the same time avoiding all the inconvenience ofleakage and repairs.

The boiler is put together by bringing the tire-box E upto the properposition, as shown, before the rear plate of the boiler is put in, whenthe rivets are putin by a person outside of the dre-box and between thesame and the outside of the boiler, who, with a suitable iron bar, holdsthe bolts or rivets in place, while another person inside the tire-boxheads down the rivets, as shown.

Although the space between the ends ot the boiler and tire-box is toonarrow to allow one to get into said space, yet by means of a curved barthe workman may readily reach down and hold the rivets in place whilethe same are being headed down; but even if the space between the top ofthe fire-box and the top of the boiler were too narrow to allow a personto occupy the same, then the riveting and heading process could beperformed before the front end of the boiler was riveted to thecylindrical part thereof.

Having thus fully described the construction of my improvedfurnace-door, what I claim as my invention, and desire to `secure byLetters Patent, is-

Constructing the furnace-doors ot' steamboilers by turning theboiler-plate inward and the furnace-plate outward and 'lapping .Q

and riveting said plates together, substantially in the manner and forthe purpose herein speciied and shown.

JAMES PENKETH. Witnesses:

Lnwrs L. GOBURN, W. E. MAUs.

